[split] finagle-memcached: fix tracing ClientRecv timestamp

The client receive tracing annotation was not being logged after the
response was received, but immediately upon invocation. This causes
for traces to show spans with incorrect timing information.

RB_ID=184733
[split] Finagle: Fix the memory leak due to the GlobalStatsReceiver

RB_ID=184337
[split] rename ostrich lib This fixes a problem with the csl release script which was looking for ${library}Version instead of ${library}Lib

RB_ID=185861
[split] bump ostrich to 9.1.4-SNAPSHOT

RB_ID=186409
TBR=true
[split] util-core: Make Future.never a val instead of a def

RB_ID=170542
[split] finagle-core: Configurable loadBalancer for ClientConfig

RB_ID=174799
[split] bump finagle to 6.6.3-SNAPSHOT

RB_ID=187617
TBR=true
[split] fixed build.scala for oss

RB_ID=187813
TBR=true
[split] manually update sbt

RB_ID=187999
TBR=true
[split] exclude CancelledRequestException and CancelledConectionException or cache client failure accrual

RB_ID=188141
[split] finagle-core: improve HeapBalancer req distribution when N=2

With 2 nodes and a stream of sequential requests,
the HeapBalancer would always choose the same node

Signed-off-by: Steve Gury <stevegury@twitter.com>

RB_ID=187179
[split] only need one set of parentheses

RB_ID=185731
[split] retryingfilter specs -> scalatest

RB_ID=184933
[split] Group: communicate via Var[Set[T]]

This will make it simpler to unify Groups with Wily.
I'm hoping to deprecate Groups entirely in favor of
Var[Addr] as per Wily, but the type may remain as a
facade.

RB_ID=183145
[split] Finagle: upgrade Netty to 3.7.0.Final

RB_ID=184661
[split] finagle-core: lets the number of cores be specified at the command line

RB_ID=183001
[split] Provide generic request contexts.

/**
 * A context is a piece of serializable metadata managed by a
 * registered handler. Protocol implementations may enumerate current
 * contexts to associate with outgoing messages; incoming contexts
 * are handled.
 *
 * Each context type is associated with a key. Keys with no
 * registered handlers are assigned a pass-thru handler: they are
 * uninterpreted, but are propagated across requests.
 *
 * Context handlers implement ContextHandler and are loaded via
 * the Java service loader mechanism.
 */

RB_ID=188653
[split] ZK based cache node group implementation

RB_ID=181107
[split] Tagging Zookeeper tests as flaky

RB_ID=191207
[split] ensure FIFO ordering when delivering updates to stabilizing group

RB_ID=191623